[O:1]1[CH2:6][CH2:5][N:4]([C:7]2[CH:12]=[C:11]([C:13]3[CH:14]=[C:15]4[N:20]([CH:21]=3)[N:19]=[CH:18][N:17]=[C:16]4O)[CH:10]=[CH:9][N:8]=2)[CH2:3][CH2:2]1.O=P(Cl)(Cl)[Cl:25]>C1(C)C=CC=CC=1.CN(C=O)C>[Cl:25][C:16]1[C:15]2=[CH:14][C:13]([C:11]3[CH:10]=[CH:9][N:8]=[C:7]([N:4]4[CH2:5][CH2:6][O:1][CH2:2][CH2:3]4)[CH:12]=3)=[CH:21][N:20]2[N:19]=[CH:18][N:17]=1To a suspension of 6-(2-morpholinopyridin-4-yl)pyrrolo[2,1-f][1,2,4]triazin-4-ol (110 mg, 0.37 mmol) in toluene (100 mL) were added one drop of DMF and POCl3 (30 mL). The flask was sealed and heated at 100° C. for 3 d. The reaction mixture was cooled to rt and concentrated in vacuo. The residue was then dissolved in DCM, neutralized with saturated aq. NaHCO3 solution and the organic layer was separated. The aqueous layer was extracted with DCM (2×50 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo to afford the desired product, which was used directly in the next step. MS(ESI) m/z 316.2/318.2 (M+H)+.
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